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Updated: Jan 15, 2026

Three-dimensional Optical-resolution Photoacoustic Microscopy

Three-dimensional Optical-resolution Photoacoustic Microscopy

Published on: May 3, 2011

Highly Sensitive Noninvasive Hemispherical Fiber Optic Photoacoustic Sensor Utilizing Dual Radial and Angular

Guojie Wu¹, Linsong Zhang¹, Tianli Gao¹

¹School of Optoelectronic Engineering and Instrumentation Science, Dalian University of Technology, Dalian 116024, Liaoning, China.

Analytical Chemistry

|January 13, 2026

Summary

This study introduces a hemispherical fiber optic photoacoustic sensor for simultaneous dual-gas detection. The novel design achieves high sensitivity and precision for trace gas monitoring, overcoming limitations of traditional sensors.

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Last Updated: Jan 15, 2026

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Published on: May 3, 2011

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Integrated Photoacoustic Ophthalmoscopy and Spectral-domain Optical Coherence Tomography

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Published on: January 15, 2013

Area of Science:

Photonics
Acoustic Sensing
Spectroscopy

Background:

Traditional spherical photoacoustic sensors have limitations in efficiently utilizing angular and radial resonances for multigas sensing.
Simultaneous multigas detection requires advanced sensor designs capable of high sensitivity and selectivity.

Purpose of the Study:

To develop a hemispherical fiber optic photoacoustic sensor (H-FOPAS) for simultaneous multigas detection.
To overcome the limitations of traditional spherical sensors by efficiently utilizing both angular and radial resonances.

Main Methods:

Integration of a hemispherical acoustic cavity with two silicon cantilever microphones (SCMs) of distinct Fabry-Perot (F-P) cavity lengths.
Utilizing white-light interferometry (WLI) based frequency division multiplexing (FDM) for demodulating the composite interference spectrum.
Employing hemispherical resonator principles to excite and detect dual resonant modes (radial and angular).

Main Results:

Demonstrated excellent linearity (correlation coefficients > 0.999) for detecting acetylene (C2H2) and methane (CH4).
Achieved high sensitivity with detection limits as low as 3.6 ppb for C2H2 and 100 ppb for CH4.
Validated performance through finite element simulations and experimental measurements.

Conclusions:

The hemispherical design offers high acoustic confinement and efficient multigas detection in a compact configuration.
The H-FOPAS enables high-precision trace dual-gas monitoring.
This sensor technology addresses the need for advanced simultaneous gas detection systems.